<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .box{
            width:200px;
            height:200px;
            background-color: #9CF;
            /*盒子模型边框的样式、颜色、粗细*/
            /* border-style:solid;*/
            /*  border-top-style: solid;
              border-right-style: dashed;
              border-bottom-style: dotted;
              border-left-style: none;
              border-color: green;
              border-width: 10px;
              */
                            /* 上下 */ /* 左右*/
           /* border-style: dashed solid;*/
         /* border-style: dashed none solid dotted;*/
            border: red solid 5px;

        }
    </style>
</head>
<body>
<div class="box"></div>
</body>
</html>